Economic impact of frosty relations between Iran and the United States

The United States played a huge part in modernizing Iran and helping them develop a strong economy, including tapping the great oil reserves the country possessed. This all happened before the Revolution though, and some believe it contributed to the unrest in the country. Whatever the cause, once the Revolution unfolded the American economic support was finished.
The United States froze roughly $12 billion in Iranian assets once the hostages were taken and to this day some of those assets remain frozen as legal claims are brought against Iran. That money will be used to pay any damages. In 1995 President Clinton made official sanctions against Iran, banning the purchase of any goods from the country and ceasing any US goods traveling into Iran. There is no end in sight to the sanctions, particularly since the government of Iran hasn’t gotten any friendlier over the years.